Author Topic: New miniature programmable DC power supply - FNIRSI DPS-150  (Read 13310 times)

0 Members and 1 Guest are viewing this topic.

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #75 on: October 06, 2024, 10:20:18 am »
Has anyone tried out how quickly it regulates the current when you plug the cables in?

I have a lab power supply which regulates too slowly.
For example, if I set it to 100mA max, then remove the cables and plug it back in, I get a peak of about 700mA for half a second until it regulates again.
This means that a DMM with a 250mA fuse then needs a new fuse. ;)

What about the DPO-150?
You can test this with a DMM, which has a “Max” setting, or with an oscilloscope and a resistor.

Thank you.
 

Offline Verticon

  • Contributor
  • Posts: 22
  • Country: de
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #76 on: October 10, 2024, 02:59:25 pm »
Hello DaneLaw,

in your picture with the power bank the display of the DPS-150 shows 28V. Is the DPS-150 connected via barrel connector? According to this thread the max. voltage via PD is 20V, isn't it. :)
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #77 on: October 10, 2024, 04:00:21 pm »
Hello DaneLaw,

in your picture with the power bank the display of the DPS-150 shows 28V. Is the DPS-150 connected via barrel connector? According to this thread the max. voltage via PD is 20V, isn't it. :)

Yes, IM running it with PD3.1 chipped cable with a barrel connector rated for the wattage.. It will take its rated 32v voltage on both its TypeC or its Barrel connector.

The DPS150 internal PD-chip can only trigger up to (20v/5A) but you can easily trigger for it, outside, and it will just take it as a crude DC input without any handshaking.
Its inner barrel connector is the 2.5mm variant.

25v/5A



130W PD3.1 powerbank


The graphing timebase segment' can be toggled between 1sec to 5sec.
and you can of course also use LIPO packs.
Like a 6cell that will be up around 24.5 to 25v when fully charged' just make sure to use cables that are rated for that amount of wattage.
Im not here, -with that amount of voltage sack.
« Last Edit: October 10, 2024, 06:50:57 pm by DaneLaw »
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #78 on: October 10, 2024, 05:34:18 pm »
Some of the features in the PC software that are just an executable. (don't need to be installed)

The start button up left, will start logging data values to an excel file..





 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #79 on: October 17, 2024, 11:04:16 am »
I got one of these today.
The accuracy is amazing for a PSU.
Also ideal as an “afterburner” for those rather crude, cheap Aliexpress PSUs if you need a bit more control.
Still a cheap solution. Together with the 300W Longwei (which I had bought before), I paid less than $100.

 :-+
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #80 on: October 17, 2024, 04:39:22 pm »
But it's pretty noisy.
Why didn't anyone tell me that?  ;)

Attached (all without load):
1. DPS-150 without 'scope BW limitation / 12V
2. DPS-150 with BW limitation 20MHz / 12V
3. for comparison my self-built (linear) PSU / 12V. Same measurement conditions, without BW limitation

P.S. On / Off characteristics here:
https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5680719/#msg5680719
« Last Edit: October 17, 2024, 05:01:44 pm by Aldo22 »
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #81 on: October 17, 2024, 06:30:19 pm »
But it's pretty noisy.
Why didn't anyone tell me that?  ;)

You didn't check the specs?
Do you have a picture of your setup..?
« Last Edit: October 17, 2024, 06:33:37 pm by DaneLaw »
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #82 on: October 17, 2024, 06:59:46 pm »
Hi

You didn't check the specs?

Where are the exact ripple/noise specs?

Do you have a picture of your setup..?

Not today, the setup is no longer there.
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #83 on: October 17, 2024, 07:07:41 pm »
Hi
You didn't check the specs?
Where are the exact ripple/noise specs?
Do you have a picture of your setup..?
Not today, the setup is no longer there.

I posted a video some weeks back also in this thread. seems it's gone, at my end
Will see if I can find it.
Reason why I ask for "setup" is to get an idea if it is the DPS150 SMPS or third party your witnessing

*One moment please (credit bigClive)*

// I recall this video also refers to the DPS150 tolerances.


The specs .. you can find in the older DPS-150 thread..not sure why this OP (LeonR) decided to restart another DPS150-thread with no input, when there already was one, just below from a day earlier that would be hard to miss  https://www.eevblog.com/forum/testgear/new-fnirsi-dps-150-mini-lab-power-supply-(30-v-5-a-usb-pd-powered)

Board pictures.(crude, from older vid)
« Last Edit: October 17, 2024, 07:58:44 pm by DaneLaw »
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #84 on: October 17, 2024, 08:01:00 pm »
It's OK.
You asked me if I hadn't checked the specs. I still don't know where to find the ripple/noise specs.
But never mind, I can measure it myself now.  ;)

Reason why I ask for "setup" is to get an idea if it is the DPS150 SMPS or third party your witnessing

The third screenshot above shows the source for the DPS -150 in the other cases. It is super quiet.
The measurement method is identical.

Thanks.
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #85 on: October 17, 2024, 08:11:15 pm »
Another observation:
When I connect the power source to the DC input, sparks fly.
This worries me a little, but it works normally.
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #86 on: October 17, 2024, 08:33:27 pm »
It's OK.
You asked me if I hadn't checked the specs. I still don't know where to find the ripple/noise specs.
But never mind, I can measure it myself now.  ;)
Thanks.

Ok?

It claims the ripple tolerances to be sub 20mV and the posted video above tries to highlight getting way below that..
https://www.fnirsi.com/products/dps-150
Its highlighted below, I even hand-drawn a heart.. :o
 
The following users thanked this post: Aldo22

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 17526
  • Country: 00
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #87 on: October 17, 2024, 08:43:28 pm »
Another observation:
When I connect the power source to the DC input, sparks fly.
This worries me a little, but it works normally.

There might be a big capacitor across the input so this is inrush current. The capacitor will look like a short circuit for a fraction of a second.


 
The following users thanked this post: Aldo22

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #88 on: October 17, 2024, 09:03:41 pm »
Do value the display, more than I reckon I would when I got it.

Having time-aspect graph/trend info.. quite helpful when trying to make heads & tail of all the different test features in a programmable electronic load.

 


Though the fastest you can get is 0.1s if I recall correctly, so fast pulses, gonna be cramped.


« Last Edit: October 17, 2024, 09:06:12 pm by DaneLaw »
 

Offline ptluis

  • Frequent Contributor
  • **
  • Posts: 409
  • Country: pt
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #89 on: October 17, 2024, 11:58:42 pm »
Another observation:
When I connect the power source to the DC input, sparks fly.
This worries me a little, but it works normally.

First connect the cable to the input of the fnirsi, then power on the input power supply, battery, etc
 
The following users thanked this post: Aldo22

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #90 on: October 18, 2024, 08:50:45 am »
First connect the cable to the input of the fnirsi, then power on the input power supply, battery, etc

Whenever possible, yes.
But not everything has a switch.
For example, the old laptop power supply (19V / 65W), which is actually quite suitable, does not have one.
Well, you can switch it on a socket strip...

It's not really a problem, just an observation.
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #91 on: October 18, 2024, 08:59:43 am »
It claims the ripple tolerances to be sub 20mV...

Thanks, I had seen that once.
But it looks to me more like it comes from the marketing department.
What does 20mV mean? mVpp?
I assume mVrms, which is not exactly low noise.

...and the posted video above tries to highlight getting way below that..

I don't know what he's doing there.
Too fast, too blurred, too vertical, too Chinese...  ;)

In addition, I now believe that when looking at or measuring spikes, it only makes sense to make comparisons with the same scope, method and setup.
Even with the same scope, you can get drastically different results depending on the acquisition method, memory depth, time scale, bandwidth limitation, etc.
So it only makes sense if you leave everything the same and then look at different PSUs.

« Last Edit: October 18, 2024, 09:11:31 am by Aldo22 »
 

Offline RAPo

  • Frequent Contributor
  • **
  • Posts: 858
  • Country: nl
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #92 on: October 18, 2024, 02:56:35 pm »
To be more precise; you have to buy a yellow DPOX180H no other scope will do. (seeking cover now  :-DD).


In addition, I now believe that when looking at or measuring spikes, it only makes sense to make comparisons with the same scope, method and setup.
Even with the same scope, you can get drastically different results depending on the acquisition method, memory depth, time scale, bandwidth limitation, etc.
So it only makes sense if you leave everything the same and then look at different PSUs.
« Last Edit: October 18, 2024, 04:23:10 pm by RAPo »
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #93 on: October 18, 2024, 04:08:45 pm »
It claims the ripple tolerances to be sub 20mV...

Thanks, I had seen that once.
But it looks to me more like it comes from the marketing department.
What does 20mV mean? mVpp?
I assume mVrms, which is not exactly low noise.


...and the posted video above tries to highlight getting way below that..

I don't know what he's doing there.
Too fast, too blurred, too vertical, too Chinese...  ;)

Usually peak to peak' but reach out and ask them.
they are one of the few that actually seem to have some customer support. (you got the link above)
sub 20mV ain't half bad and as highlighted..the fellow in the video, writes that he got 8mV so way below the 20mV

If low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.

Look instead for a linear bench supply.. they cost around the same, not much more.. 60 to 70 euro from brands like Korad, and from western resellers, but they are heavy as.
Got two myself. https://tinyurl.com/5n94yxjn
The noise I experienced in fx AlienTek DP100 is certainly not bad for an SMPS product of this size.
If I recall correctly, its pp-rated sub 10mV but only goes to 100W

If your unsure, on how to measure and don't screw up your measurement from bringing in third party noise, you can maybe get some hints from Dave's video, alongside something to compare against, where he tested the DP100.
From +27:30

 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #94 on: October 18, 2024, 04:53:27 pm »
@RAPo
@DaneLaw

To be more precise; you have to buy a yellow DPOX180H no other scope will do. (seeking cover now  :-DD).

I don't think so.  :-DD
Even with the cheapest desktop scope, you can control what you want to see much more than with the handhelds.
I don't have a DPOX, but I do have a Zeeweii.

Take a look: This is the same signal viewed with the Hantek. Once I want to see the noise (Peak Detect, "dso2000_dps150_peak.png" ) and once I only want to see the repetitive part of the signal (Average, "dso2000_dps150_avg.png").
I don't know the DPOX, but with the Zeeweii I only have one possibility ("zeeweii.png").
Again, this is all the same signal!

The signal generator is an XR2206, which is fed by the DPS-150.

If the XR2206 is fed with a linear PSU, it looks like in "dso2000_lin_peak.png" (Peak detect) and "dso2000_lin_hr.png" (High Res.).
So much less noise.
« Last Edit: October 18, 2024, 04:59:12 pm by Aldo22 »
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #95 on: October 18, 2024, 05:21:54 pm »
If low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.

It's all good.
I definitely have a use for these devices.
I'm not complaining, I'm just noting (for others) that the DPS-150 has a certain amount of noise.
Not as bad as the Longwei, but definitely noticeable.
I don't regret the purchase.
 

Offline DaneLaw

  • Frequent Contributor
  • **
  • Posts: 661
  • Country: dk
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #96 on: October 18, 2024, 08:28:06 pm »
If low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.

I'm not complaining, I'm just noting (for others) that the DPS-150 has a certain amount of noise.
Not as bad as the Longwei, but definitely noticeable.


The thing Im trying to highlight is the fact that the noise your showing in your pictures doesn't have to be from the DPS-150, as it's quite intense, could be third-party aspect that is introducing it.

According to your own pictures, when you're using the extremely noisy sub 50$ switch-mode Longwei bench supply, to run your DPS-150 you're gonna put a lot of noise into the DPS 150, same with many power sources.
https://www.eevblog.com/forum/testgear/new-miniature-programmable-dc-power-supply-fnirsi-dps-150/?action=dlattach;attach=2404921;image

Garbage in, garbage out.. its not gonna filter all that out.. its a tiny supply... also what is explained in the video with the timestamp I gave you.
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #97 on: October 18, 2024, 09:09:11 pm »
Hi

The thing Im trying to highlight is the fact that the noise your showing in your pictures doesn't have to be from the DPS-150, as it's quite intense, could be third-party aspect that is introducing it.

No, I want to be fair to the DPS-150.  ;)
I only feed it with the output of the linear PSU.

The fourth picture above “dso2000_lin_peak.png” shows the “sine” of the XR2206 with the linear PSU at the input.
In the first picture “dso2000_dps150_peak.png” only the DPS-150 is connected in between. The DPS-150 gets the same input as the XR2206 in the other picture. No Longwei or other SMPS  are involved.
So I can say that the noise is probably coming from the Fnirsi.

But of course I set the oscilloscope, the probes and the amplitude of the XR2206 so that you can see the noise very clearly (No BW Limit, Probes 10x, Peak detect, low voltage...).
Nevertheless, “dso2000_lin_peak.png” and “dso2000_dps150_peak.png” were taken under exactly the same conditions.
The difference is real.
« Last Edit: October 18, 2024, 09:15:22 pm by Aldo22 »
 

Online Aldo22

  • Super Contributor
  • ***
  • Posts: 1275
  • Country: ch
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #98 on: October 19, 2024, 11:31:32 am »
Does anyone have information about the control protocol?
The PC program shows that it can be controlled remotely (USB).
But I would prefer to control it from Linux. A Python script/interface without GUI would be great.
Is there any information available?
 

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 17526
  • Country: 00
Re: New miniature programmable DC power supply - FNIRSI DPS-150
« Reply #99 on: October 20, 2024, 06:39:13 pm »
If it's anything like previous models it'll be a serial port with CH340 chip inside it.

You could tap into the serial data and look at the protocol. I bet it's not complex.

 
The following users thanked this post: Aldo22


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf